High-precision 14C measurements of parenchyma-rich Hymenolobium petraeum tree species confirm bomb-peak atmospheric levels and reveal local fossil-fuel CO2 emissions in the Central Amazon
High-precision 14C measurements of parenchyma-rich Hymenolobium petraeum tree species confirm bomb-peak atmospheric levels and reveal local fossil-fuel CO2 emissions in the Central Amazon
复制标题
对富含薄壁组织的 Hymenolobium petraeum 树种进行高精度 14C 测量，证实了大气峰值水平，并揭示了亚马逊中部当地的化石燃料二氧化碳排放量
DOI：
10.1016/j.envres.2022.113994
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发表时间：
2022
影响因子：
8.3
通讯作者：
das Neves Brandes, Arno Fritz
中科院分区：
文献类型：
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作者：
Santos, Guaciara M.;Albuquerque, Rafael Perpétuo;Barros, Cláudia Franca;Ancapichún, Santiago;Oelkers, Rose;Andreu-Hayles, Laia;de Faria, Sergio Miana;De Pol-Holz, Ricardo;das Neves Brandes, Arno Fritz
树木年轮中记录的大气放射性碳（14 C）已被广泛用于大气14 C校准和气候研究。但大气中14 C的记录仅限于沿着热带纬度。在这里，我们报告了一个从1938年到2007年的一系列精确测量的14 C日期在树轮的薄壁组织丰富的膜厚壳属petraeum树种（波尔图特龙贝塔斯，1°S，56°W）从巴西亚马逊河流域中部。Petraeum有明显的生长环边界，允许使用测年技术来产生精确的日期。爆炸峰树轮14 C重建与南半球大气14 C曲线（SH区3; ±2σ区间内的值）报告值相关的更广泛变化相吻合，表明在密集大气核试验期间注入平流层的过量14 C的半球间空气质量输送在不同的纵向区域相对均匀。从20世纪80年代初开始，H. Petraeum的14 C值低于其他泛热带记录。基于碳14的估计，我们发现了一个强大的影响，化石燃料的CO2贡献波尔图特龙贝塔斯采矿作业和航运交通的内陆水道。14 C检测到化石燃料CO2至少增加了6.3 ± 0.8 ppm。我们的研究结果邀请进一步的14 C分析，使用树木年轮的热带树种作为一个潜在的示踪剂的大气14 C变化的广泛的环境来源。
Atmospheric radiocarbon (14C) recorded in tree rings has been widely used for atmospheric14C calibration purposes and climate studies. But atmospheric14C records have been limited along tropical latitudes. Here we report a sequence from 1938 to 2007 of precisely measured14C dates in tree rings of the parenchyma-richHymenolobium petraeumtree species (Porto Trombetas, 1°S, 56°W) from the Central Brazilian Amazon.H. petraeumhas discernible growth ring boundaries that allow dating techniques to be employed to produce calendrical dates. Bomb-peak tree-ring14C reconstruction coincides with the broader changes associated with reported values of the Southern Hemisphere atmospheric14C curve (SH zone 3; values within the ±2σ interval), suggesting that inter-hemispheric air-mass transport of excess-14C injected into the stratosphere during intensive atmospheric nuclear tests is relatively uniform across distinct longitudinal regions. From the early 1980s onwards,H. petraeumhad lower14C values than other pantropical14C records. Through14C-based estimation, we found a strong influence of fossil-fuel CO2contributions from Porto Trombetas mining operations and shipping traffic on inland waterways. An increase of at least 6.3 ± 0.8 ppm of fossil-fuel CO2has been detected by14C. Our findings invite further14C analyses using tree rings of tropical tree species as a potential tracer for a wide range of environmental sources of atmospheric14C-variability.